Too late after you shot it to worry about scratching the bore, always clean before you fire the first shot. Hard to believe the manufacturers would leave that much in the barrel, they high pressure oil rinse multiple times and some may escape but not the amount your talking about. Look at your brass, is the head being shaved off when you close the action ? What about the front of the case, are they so long their going into the rifling ? Chamber a loaded round and then pull it out, is the bullet to far out and hitting the rifling ?